Adding an image to a video, but the video isn't playing after addition
Replace the &quot;replace&quot;-blend mode to &quot;alpha over&quot; or whatever your default is there in items like here:

Also you can resize your image/video in the settings and place them via x,y.
Just tap on your video, then go to effect-strip -&gt; transform like this:

Here you can set x/y and the size...and don't forget to change blend to alpha over again.